本文利用2001年3月19日至22日期间ACE卫星观测的行星际资料、电离层垂测仪资料以及中国地区TEC资料,分析了发生在这期间的电离层暴过程.结果表明:(1)日冕物质抛射造成的行星际环境为电离层暴的发生提供了大尺度环境背景;(2)强烈的电离层负暴发生在磁暴恢复相阶段;(3)强烈电离层负暴能够用暴环流理论解释. This paper analyzes the ionospheric storm process during this period by using the inter-satellite data of ACE satellite observations, the ionospheric vertical well instrument and the TEC data of China from March 19 to 22, 2001. The results show that: (1) The interplanetary environment caused by the coronal mass ejection provides a large-scale environmental background for the occurrence of ionospheric storms. (2) The intense ionospheric negative storms occur during the storms recovery phase. (3) Explanation.